EXCEPT based on a specific column value...

I have two tables of user data. There is a unique identifier for a each user. The data in Table A has priority. I want a query that selects all of the users in table A and the users in table B that don't have a row in Table A. While the unique id will identify
them, the rest of the data may not be the same, so I can't use an EXCEPT. Unless there is a way to say EXCEPT based on just the unique id. There are several million rows. What's the most efficient way to accomplish this?
Would I just add a where clause with a NOT IN subquery listing the unique ids?
Thanks.
J
http://digitalcamel.blogspot.com/

>> I have two tables of user data. <<
As opposed to your “non-user data”; think what you are saying and where it the DDL is. Now we start guessing and trying to read your mind.
>> There is a unique identifier for a each user. <<
Yes, this is the definition of an entity. But how did you model it? Where is the DDL?
>> The data in Table A has priority. <<
what does that Crap mean? In RDBMS, all sets are equal without any concept of a “priority”, so you are absurd. Also. Why do you think that “A”, “B”, etc are good names for a table? They are the names of the physical disk or tape drive in 1970's hardware.
>> I want a query that selects all of the users in table A and the users in table B that don't have a row in Table A. <<
If you were competent, the DDL you weer too rude to post, would have a single Users table with a user_type of {'a', 'b'} as an attribute.
This is called attribute splitting and it is a classic design error.
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

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Well, first of all, you didn't use the code tokens for your posting. Second, this source won't even compile how you have it. But anyway...
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Hi Jhonny86,
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EXCEPT based on a specific column value...

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